Retarder

Details Retarder Retarder

1997-06-12

2001-05-22

Graham, Matthew C. (Department: 3613)

Brakes

Internal-resistance motion retarder

Using a rotary-type fluid damper

C188S290000

Reexamination Certificate

active

06234285

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a retarder which is part of a drive assembly, notably for vehicles and specifically in conjunction with an internal combustion engine and a transmission.
2. Description of the Related Art
A drive unit with a retarder and a transmission is known from German Patent Document DE 44 40 165 A1.
Owing to their particular properties, hydrodynamic retarders are recently being increasingly employed. Their operation involves neither wear nor fatigue, enabling them to reliably retard vehicles with large masses on longer grade stretches.
Vehicle manufacturers insist on a maximally compact design of the individual units of drive assemblies. Besides, easier and faster assembly and disassembly of the individual units is desirable, both for purposes of first assembly and also service work. This is true particularly for the retarder.
German Patent Document DE 38 37 142 A1 shows and describes a retarder which, as a self-contained assembly, can be installed from outside in a housing of a change-speed gearbox. While this occasions a certain simplification over other retarders, this prior retarder, however, is not optimal with respect to its manufacture and the space needed.
SUMMARY OF THE INVENTION
The retarder assembly of the present invention includes a retarder housing, a stator disposed within said retarder housing, and a retarder shaft fitted with a rotor enclosed by a rotor housing. The retarder housing accommodates the rotor and stator and is intended for assembly into a transmission housing. The retarder housing has a cup-shaped recess that matches the outside contours of the rotor, said rotor housing and said stator, thereby enabling the retarder housing to receive the rotor housing with the rotor and stator in assembled state to form a retarder unit.
The objective underlying the invention is designing a retarder to the effect that it consists of few components and that it allows quick and process-matched assembly and disassembly.
The inventional design of the retarder makes it possible to prefabricate its hydrodynamic components and their mounting and to insert it in completely assembled state, as a cartridge, in the retarder housing. Thus, it is no longer necessary to fix the rotor or the stator by screwing; instead, mounting can be accomplished by clamping or bolting. A screw joint on the back of the retarder is dispensable. The option of manufacturing the hydrodynamic components of the retarder as a complete unit in a preassembly operation allows drastic reductions in manufacturing costs.


REFERENCES:
patent: 3367461 (1968-02-01), Nagel
patent: 1946167 (1970-05-01), None
patent: 2 203 319 (1973-08-01), None
patent: 38 37 142 A1 (1989-05-01), None
patent: 44 40 165 A1 (1995-07-01), None
patent: 7317412 (1974-12-01), None

Affiliated with

Also associated with

Rating

Retarder does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Retarder, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Retarder will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2555412